Bengal Gold Roach Spray goes beyond just killing roaches by offering long-lasting protection, preventing reinfestation for up to 6 months. With a 2% concentration of Permethrin, a highly effective insecticide, this dry, powerful spray penetrates deep into cracks, crevices, and hard-to-reach areas to flush roaches out of hiding and eliminate them. Its advanced formula reaches behind walls and carries the killing agent deep into infestations for maximum performance and results. Nylar is the chemical Pyriproxyen, which is an insect growth regulator! Nylar breaks the lifecycle by sterilizing adult cockroaches--preventing immature roaches from developing into breeding adults. It's birth control for roaches! Nylar content in Bengal Gold is the highest of any spray product on the market.